Barrel-changing device for automatic firearms



March 7, 1939. E. M RBA 2,149,707

BARREL-CHANGING DEVICE FOR AUTOMATIC FIREARMS Filed Nov. 50, 1956 Emf MUYbQCh INVENTOR BY 2W ATTORNEY Fatented Mar. 7, i939 entree stares ZAQQJW BARREL-(CHANGKNG DEVKCE FQR AUTO- MA'JIKC IFHREARMS Emil Mnrbach, Budapest, Hungary, assignor of one-half to Danuvia Epari s Kereslredelml R. T findapest, Hungary, a firm Application November 3t, 1936, Seriai No. 113,349 lln Germany December 2, 1935 4 Claims.

My invention enables me to provide for the change of the hot barrel of automatic firearms by one movement of the hand of the operator and without .the help of moving parts of the fore-arm of the weapon.

lhe invention is shown in Figs. 1, 2, 3 and 4.

Fig. 1 is alongitudinal section of the firearm, showing the barrel in its firing position.

Fig. 2 shows'how the barrel is lifted from the firearm.

Fig. 3 shows the hash shield, arranged for modification of the recoil.

Fig. 4 shows the handle of the barrel at a somewhat enlarged scale.

Referring to the drawing, 6 denotes the receiving or stock portion of the fire-arm from the forward end of which a supporting or semicylindrical guide 2 projects, the open side of the latter being arranged along the top. The outer or muzzle end of the guide 2 is cylindrical and internally threaded to receive the threaded shank of an outwardly flared flash concealing shield 3. The flash concealing shield 3 is tapered outwardly in its inner wall in opposite directions, the diameter of the opening being smallest just short of its inner end.

Supported in the flash-concealing shield 3 is the muzzle end of a barrel 4, which fits closely in the smallest diameter of the flash-concealing shield 3, and which because of the oppositely tapered bore thereof is capable of .being tilted upwardly out of axial alignment with the flashconcealing shield 3 to permit removal, as illustratively exemplified in Figure 2.

The opposite or breach end of the barrel 4 is removably secured in the stock I by any suitable means, butfor illustrative purposes, an arrangement has been adapted which comprises a series of interrupted transverse ribs and a in the handle and engages the under side of the lever 8 to urge it upwardly, whereby the opposite end thereof which is provided with a tooth I0 is engaged in an opening running through a the sleeve 5 and barrel 4 to prevent rotation of the latter.

Adjacent the outer or muzzle end of the barrel l is-a fixed collar 6 which acts as a stop, abutting the inner end of the flash-concealing shield 3, when the barrel is released and projected in order to raise the breach end, as shown in Figure 2. 5

To change the barrel one hand of the operatorgrasps the handle 5, one finger pressing down the right arm of the catch 8, thus lifting its tooth it from the corresponding cut in the sleeve 5. The barrel may then be turned and pushed 10 forward about 1 to 1.5 inches, until its collar 6 abuts the flash-concealing shield 3. The barrel is then retracted from its seat and can be tilted upwards and lifted from the barrel guide 2.

The fresh barrel is brought into position by 15 manipulating in the reverse order. The muzzle of the barrel will easily glide into the flash-concealing shield.

In some cases the flash-concealing shield preferably can be adapted for modifying therecoil. 20 This is done by designing its-fore part so as to form a central circular diaphragm l, the opening of which may be of a smaller diameter than that of the outside of the muzzle of the barrel. This diaphragm l is placed sufliciently far in 25 advance of the muzzle to permit forward movement of the barrel in order to release it from the. receiver or stock I. The diaphragm l is preferably integral with the walls of the flash shield although it may be a separate piece mounted in and attached to the latter.

The invention can be made use of with automatic arms either with moving or with stationary barrel.

Having now particularly described and ascertained the nature of my said invention, and in what manner the same is to be performed, I declare that what I claim is:

1. In a firearm of the character described. the

combination with a stockand extension therefor 4 of a removable barrel, supported in the stock and extension and a flash-concealing shield rigidly secured to the outer end of the extension and having a bore tapering inwardly from opposite ends to form a throat adjacent the rear end of 45 the shield for supporting the muzzle end of the barrel, while the double taper permits the sameto be tilted and withdrawn from the shield, the barrel being of such length that, when its rear end is locked to the stock, its muzzle end is 50 spaced well back from the front end of the shield to permit hot products of combustion discharged from the muzzle to expand and be retained temporarily in the enlarged bore of the outer end of the shield. 56

2 nearer 2. A firearm, as claimed in claim 1, in which the taper at the inner end of the shield has a greater angle than the taper at the other end.

3. A firearm, as claimed in claim 1, having a collar fixed on the barrel short of the muzzle end thereof to abut the supporting piece and limit the forward movement of the barrel when being removed and replaced in the firearm.

4. A firearm, as claimed in claim 1, comprising a handle carried on the rear end of the barrel,

and a spring controlled latch pivoted to said handle and provided with a tooth to engage v simultaneously notches in the barrel and ex-' tension to prevent the barrel in its firing position from rotating out of connection with the extension.

EMJL MURBACH. 

